Contamination is the number one cause of "weird" results. Check your units: Are you measuring in cm3c m cubed mm3m m cubed ? Converting correctly is vital.
Draw only the tissue layers (e.g., epidermis, xylem, phloem). No shading or sketching allowed. . Ensure units are converted to micrometers ( ) before calculating. 🧪 Core Skill 2: Biochemical Testing
Random: Difficulty in judging a color change (end-point). Use a colorimeter or a standard color chart to improve this. 💡 Quick Tips for Exam Day biology 9700 practical notes
Join points with straight lines (ruled) unless a "best-fit" line is specifically requested. Circle outliers if they are clearly anomalous. ⚠️ Identifying Variables and Errors You will be asked to critique your experiment. Be specific.
What you change (e.g., concentration). Dependent Variable: What you measure (e.g., volume of gas). Contamination is the number one cause of "weird" results
on the X-axis; Dependent on the Y-axis. Use at least 50% of the grid provided.
Mix sample with ethanol, then add water. Positive result: Cloudy white emulsion. 📉 Core Skill 3: Data Presentation and Analysis Draw only the tissue layers (e
The microscope is a staple of the 9700 syllabus. You must be comfortable with both low and high-power lenses. Always remember the formula: Plan Diagrams: Do not draw individual cells. Use clear, sharp, continuous lines.
It takes 5 minutes but prevents mistakes later.
You must know the reagents and the specific color changes for biological molecules. 🍱 The Big Four Tests